Soap manufacture



- phenyl and 4-hydroxy-dip l at'ented Aug. 25, l93l UNITED sTA Es crmnnns r.

PATENT OFFICE soar mnnurac'runn Ho Drawing.

This invention relates to an improved sta-- bilized soap and to methods of manufacturing the same.

According to this invention, soap is stabilized by the addition of a small amount of an aryl phenol thereto. 7 More particularly, the stabilizers referred to in this application are the hydroxy-diphenyls such as 2'-oxy-dihenyl.

light or air, and will prevent or retard the formation of freefatty acids within the soap when the soap is subjected to the action of air or sunlight.

A small amount of the stabilizer gives good results. A few tenths of a percent is in general satisfactory. I hav found that the stabilizer may be incorporated in the soap in various ways. The

\ stabilizer may be added to the soap stock before sa-ponification in an amount equivalent to about two-tenths of a percent calculated on the weight of the soap stock. The desired which will be carried by the oils \thru the saponification process and will-be present in the finished soap.

As an alternative method, the solution of the desired amount ofstabilizer in some vola- Applieat'ion filed January 31, 1929. Serial No. 336,655

tile organic solvent, such as alcohol, benz-ol.

KAEGEBEHN, 0F HOBOKEN, NEW JERSEY, ASSIGNOR TO B. '1. VANDERIBILT I 00., INC OF NEW YORK, N. Y., A CORPORATION OF NEW YORK etc., is added to the. soap while it is being milled and the stabilizer is thus incorporated into the soap. On milling, the heat of-the rolls will volatilize the-solvent leaving the anti-oxidant disposed thruout the soap.

1 Experiment has shown that soap containing two tenths of one'percent of an hydroxy-, diphenyl will remain relatively sweet. and white after exposure to oxygen at a temperav ture of about C. for 72 hours, and there will be only a relatively small amount of free fatty acid formed whereas a similar soap to which no stabilizer has been added, when subJected to the same test, will darken in color, become rancid and show a marked increase in free fatty acid content. A small amount of an-aryl phenol, such as a phenyl-phenol, I

will prevent or retard the action of sunlight on soap. Tests show that a soap containing a small amount of a phenyl-phenol will remainsweet and white for a much longer time than a soap which contains no stabilizer.

The term hydroxy-diphenyl is used in the claims to include hydroxy-dip'henyls and salts or derivatives thereof.

I clSaim: 1. oap comprisin a fatt acid com ound and 4-hydroxy-diphgnyl. y

. 2. The method of making soap which comprises adding a fraction of a per cent of a hydroxy-diphenyl to the soap stock, saponi fying and milling in the usual manner and obtaining as a final product soap comprising a small amount of hydroxy-diphenyl.

3. Soap comprising a fatty acid compound and an liydroxy-diphenyl.

4. Soap comprising a; fatty acid compound I and a fraction of a percent of anhydroxydiphenyl.

5. In the processof making soap, the step which comprises adding a fraction of a percent of an hydroxy-diphenyl to the soap stock. y

6. In the process of'makin'g soap the step which comprises adding a fraction of a percent of an hydroxy-diphenyl to the soap durin the milling procss.

In the process of making soap, the steps which comprise adding a fraction of a pernon cent of a hydroXy-diphenyl dissolved in a. suitable solvent to the soap during the milling process and volatilizing the solvent during the milling by the heat of the rolls of the milling machine.

8. In the process of making soap, the step which comprises adding a fraction of a percent of 4-hydroXy-diphenyl to the soap stock.

9. In the process of making soap, the step which comprises adding a fraction of a per- U cent of an hydroxy-diaryl compound to the soap stock.

10. In the process of stabilizing soap, the step which comprises adding a fraction of H a percent of 4-hydroxy-dipl1enyl thereto. 11. In the process of stabilizing soap, the step which comprises adding a fraction of a percent of an hydroxy-di'aryl compound thereto.

In testimony whereof I affix my signature.

CHARLES F. KAEGEBEHN.

GERTEFEGATE 0F CORRECTION.

Patent No. 1,820,744. Granted August 25, 19 1, w

CHARLES F. KAEGEBEHN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 8, 0 yread y Y-; page 2, after line 18, insert the following as claim l2:

l2. Soap containing hydroxy-diaryl compounds as oxidation inhibitors;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of December, A. Do 1931.

Ml. J. Moore, (Seal) Acting tflcrnnnissioner of Pa ents. 

